@rem :0.024275rem;
.page_head{
  height:40*@rem;
  background-color: red;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 15*@rem; 
  .menu{
    width:26*@rem;
    height:26*@rem;
    img{
      width:100%;
    }
  }
  .top_nav{
    width: 50%;
    display: flex;
    justify-content: space-around;
    img{
      opacity: 0.5
    }
    .active{
      opacity: 1;
    }
  }
  .search{
    opacity: 0.7;
  }
}